This dream may symbolize your personal growth and development. The baby represents a new beginning or a new project that you are nurturing and taking care of. The fact that you mention it is the niece of your half brother could suggest that this project or new phase in your life is connected to your family in some way. As the baby grows up, it could represent the progress and success of this project or phase. The library could symbolize knowledge and learning, suggesting that you are seeking knowledge and information to help you with this new endeavor. The mountain freeway could represent the challenges and obstacles you are facing on your journey. The darkness could symbolize uncertainty or fear, but the fact that you are with your family and other children could suggest that you have a strong support system and are not alone in facing these challenges. The fact that you paid for the rooms and only had a few items with you could symbolize your determination and focus on this new project, despite any distractions or setbacks. Overall, this dream may be a reflection of your determination and growth, as well as the importance of family and support in your journey.